
Proxyman.io
Postman
ngrok
Hoppscotch
HTTP Toolkit
Fiddler
Charles Proxy
A Powerful API Mocking and Testing Tool

Apiary
API MAKER
APIs With GitHub
JustAPIs
Turn your data into an API in 10 minutes.
Which is more popular?
Based on our record, Requestly seems to be more popular. It has been mentioned 35 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | requestly.com | simpledataapi.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from the United States · 20 - 49 employees · 2021 | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


Requestly is a modern and powerful companion for API Development and Testing. It is an open-source tool purpose-built to speed up and simplify API development workflow for developers and QAs. It is a combination of API Client and HTTP Interceptor that helps create and share API Contracts, testing...
Why you'll love it: -Keep content control with non-technical teams while giving developers a stable endpoint they can depend on in production. -Non-technical teams who still need reliable live API updates for screens, campaigns, and product details without waiting on engineering sprint cycles....
What each product offers, as listed by its team.


An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Get Started with Requestly
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Requestly and Simple Data API.
Requestly's answer
Requestly's answer
Front-end developers, QAs, PMs, Digital Marketers
Simple Data API's answer:
The primary user is either A.) a non-technical person who needs to ship structured data to their webapp, page, or online tool. Or, B.) a web developer who doesn't need to develop a full CMS solution for a small amount of custom, frequently changing client data.
Requestly's answer
Requestly is an open-source API development and testing tool that combines the capabilities of an API Client and HTTP Interceptor, making it a better alternative to Postman + Charles Proxy. It simplifies API mocking, request modification, and debugging with an intuitive no-code interface, enabling developers and QAs to test APIs efficiently.
Simple Data API's answer:
specifically build for non technical users to control the frequency of their data and updates. Helps developers focus on the project, not the data.
Simple Data API's answer:
Easy to get started in minutes. Inexpensive and easy tool for the freelance toolkit. Client friendly, easy to edit, easy to share.
Simple Data API's answer:
As a webdev, I've built a lot of websites that were bloated with databases and content management just to update a few lines of text a few times a week. This solution give developers and easy to access dynamic endpoint, and keeps the client in control of their structured data in an easy to update form.
Simple Data API's answer:
next.js, typescript
Share your experience with using Requestly and Simple Data API. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


On the pricing front, Requestly strikes a balance between affordability and functionality. It is an open-source tool, offering freemium to individual developers and affordable pricing plans for team collaboration. We...
We have no reviews of Simple Data API yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


If you want to try a local-first workflow, you can start using Requestly here: https://requestly.com. - Source: dev.to / 11 months ago
That’s where automation changes the game. By pairing Cursor, an AI-powered coding assistant, with Requestly's local-first API testing and mocking platform, you can offload the grunt work of writing tests to AI while keeping execution... - Source: dev.to / 11 months ago
Requestly is a versatile browser extension and web client used to intercept, mock, and debug APIs in real-time—perfect for frontend developers. - Source: dev.to / over 1 year ago
Tracking Simple Data API since May 2026.
When comparing Requestly and Simple Data API, you can also consider the following products.

Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
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Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
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The Collaboration Platform for API Development
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ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
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Create simple JSON APIs with GitHub Repository
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